Plants use sunlight as energy to convert carbon dioxide and water into glucose and oxygen. Which best describes the reaction? The law of conservation of mass indicates the same amount of carbon will be found in the reactants as in the products. O The law of conservation of energy indicates the same amount of carbon will be found in the reactants as in the products. O The law of conservation of mass indicates the same amount of glucose will be found in the reactants as in the products. O The law of conservation of energy indicates the same amount of glucose will be found in the reactants as in the products.

Manufacturers of headache remedies routinely claim that their own brands are more potent pain relievers than the competing brands. Their way of making the comparison is to compare the number of molecules in the standard dosage. Tylenol uses 325 mg of acetaminophen (C8H9NO2) as the standard dose, while Advil uses 2.00 x 102 mg of ibuprofen (C13H1802). Find the number of molecules of pain reliever in the standard doses of (a) Tylenol and (b) Advil. (a) Number Units (b) Number Units

A 0.0545 kg chunk of an unknown metal that has been in boiling water for several minutes is quickly dropped into an insulating Styrofoam beaker that contains 0.462 kg of water at room temperature (20.0° C). After waiting for a few minutes, you observe that the water's temperature has reached a constant value of 22.0° C. Part A Assuming that the Styrofoam absorbs a negligibly small amount of heat and that no heat was lost to the surroundings, what is the specific heat of the metal? Express your answer in joules per kilogram-kelvin to three significant figures. ΑΣφ J/(kg · K) C = Submit Request Answer Part B Use the table below to identify the metal. Specific heat (c) Material J/(kg K) cal/(g K) Solids Lead 0.13 x 103 0.031 Mercury 0.14 × 103 0.033 Silver 0.23 × 103 0.056 Copper 0.39 × 10³ 0.093 Iron 0.47 x 103 0.112 Marble (CACO3) 0.88 × 10³ 0.21 Salt 0.88 × 103 0.21 Aluminum 0.91 × 103 0.217 Beryllium 1 97 x 103 0.471

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Electric vehicles increase speed by using an electric motor that draws energy from a battery. When the vehicle slows, the motor runs as a generator, recharging the battery. Explain why this means that an electric vehicle can be more efficient than a gasoline-fueled vehicle.

Plasma spraying is a process used to coat the surface of a material with a protective layer to prevent material degradation. In a plasma spray process, the protective coating in powder form is injected into a plasma jet. The powder is then heated until the droplets coalesce and are propelled over the surface of the material. Once deposited on the surface of the material, the molten droplets solidify and form a protective coating layer. Consider a plasma spray process using alumina (k = 30 W/m K, ρ = 3970 kg/m³ and cp = 800 J/kg K) powder that is injected into a plasma jet at T∞ = 15,000 ° C and h = 10,000 W/m²·K. Alumina powder is made up of spherical-shaped particles with a mean diameter of 60 μm and a melting point of 2300 °C.Solving, the amount of time it would take for the particles, with an initial temperature of 20 °C, to reach their melting point from the time they are injected into the plasma jet is 5,25x10 -4 s. The mathematical resolution is in the image. I only need the…

What is the ΔS° for the reaction? Given are the S°, in J K-1 mol-1, of each substance in parentheses. SiCl4 (g, 330.73) + 2 Mg (s, 32.68) → 2 MgCl2 (s, 89.62) + Si (s, 18.83)     -198.02 J/K     198.02 J/K     -254.96 J/K     254.96 J/K

A manufacture claims that a teakettle has an output of 5.2kw. A test is done by heating 1liter of water. The water is initially at room temperature 22C and in 3 min the water reaches the boiling point. What can be said about the manufacture claim.  I used equation P=Q/t and got q= 936kw/s. But this can't be it, I don't think. Can you help me through this problem?  Thank you for your time and help.